Watch screw-driver.



L. E. F. WAGHTER. WATCH SGREWIDEIVER. APPLIOA'QION FILED APR. 29, 190B.

Patented Mar.25 ,191-3.

WITNESSES.

LOUIS E. F. WACHTER, OF HARTFORD, CQIINECTICUT.

WATCH SCREW-DRIVER.

Specification of Letters Patent.

Patented Mar. 25, 1913.

Application filed April 29, 1908. Serial No. 429,904.

To all whom it. may concern 'Be it known that I, LOUIS E. F. WACHTER,

a citizen of the United States, residing at Hartford, in the count ofHartford and State of Connecticut, ave invented certain new and usefulImprovements in Watch Screw-Drivers, of which the following is aspecification.

This invention relates to tools and more particularly to screw drivers,while the principal object is the construction of a screw driver for useof watch makers or jewelry repair purposes.

For some special purposes the blade of a screw driver wears at the endwhich engages the screw, and particularly is this the case in the use ofscrew drivers for watch repair where frequently it is intended that theblade should not be quite as hard as the metal of the screw, so as notto bur the slot in a screw, or otherwise injure the article beinghandled. In these cases the end of the blade is sharpened by theoperator, and in practice results in rapidly using up the blade.

.To meet such and other requirements in practice, my invention comprisesa screw driver handle with a bla e of unusual length, and so arrangedthat as fast as it is worn and resharpened, the blade may be veryconveniently and simply projected outward, while at all times theoperative'end of the blade is securely held by the handle so that theturning efiort of the operator is transmitted to the blade near itsprojecting end.

I have illustrated one embodiment of my invention in the accompanyingdrawings, forming a part hereof, in which:

Figure 1 is a longitudinal section; Fig. 2 isan enlarged sectlon at A-Ain Fig. 1; Fig. 3 is an, enlarged section at BB in Fig. 1; Fig. 4 is aview of theadjusting sleeve partly broken away; Fig. 5 is a view 45 ofthe blade; Fig. 6 is a detailed view of cap 6.

In the drawings C is the body of the handle, D is the driving end of thehandle,

E is the cap or push end of the handle, 50 comprising the cap e and theferrule e which screws onto the sleeve C, e and 6' being rivetedtogether by the rivet 6 F is the blade with its head G. The ad- 'ustingsleeve H has a head J which may 5 be knurled, while the interior of theadjusting sleeve is threaded as at h.

In this particularv embodiment of my. invention, the turning end or tipof the driver D is screwed to the sleeve 0, or it may be otherwisepermanently secured thereto or formed integral therewith. The blade F isthen inserted in the sleeve C, and [its in an angular hole passingaxillary through the tip or driving end I). Theadjusting sleeve H isthen inserted and fits closely in the sleeve C, and its internal threadsin engage the threads on the head G of the blade, While H is screwedonto the blade head thereby pulling the blade, held against rotation byits fit in the angular hole 1n the tip D, so that the blade will recedefrom the end of the tip leaving sufficient projection for pro-peroperation of the blade end. The cap or head E is then screwed onto thehead 0, and may be semi-permanently secured to prevent accidentalloosening. This cap is recessed so as to fit over the head J of theadjusting sleeve H, and bring the base of the recess in thrust bearingengagement with the head J of the sleeve H. The head J may be knurled orotherwise roughened to be conveniently turned by thumb and finger, andoppositethis head the side of the cap e is cut away so that the thumbandfinger may engage the head J of the adjusting sleeve. It will thus beseen that the cap portion 6 of the head E is adapted to receive thepressure of the finger necessary to hold the screw driver in engagementwith the screw. When the blade tip wears off and is ground or sharpened,the adjusting sleeve H can be turned by means of its head J and thethreaded interior engaging with the head G of the blade will project theblade outwardly, thereby permitting its adjustment to the desired extentas fast as the blade is worn away. In order that the fingers may securean effective purchase on the sleeve C it may be fluted or otherwisecorrugated or roughened, as, for instance, shown at c in Fig. 2.

While the ready adjustment of the screw driver blade, as described, isvery efiicient, convenient and practical, particularly for such purposesas watch makers screw drivers, it will be seen that by my constructionit is possible to entirely renew the blade, only a small part of thedevice, without therenewal of the entire screw driver. By the use of mydevice a watch maker becoming accustomed to a particular form of handlecan always use the same handle and simply renew the blades as they wear.Furthermore, as an operator becomes accusdescribed herein,

I ters Patent is:

tomed to work with a certain length of projecting blade, he can likewisekeep theprojecting blade, and therefore the total length of his screwdriver uniform in spite of constant wear.

It will be evident that various modifications may be made from theparticular form illustrated in my drawings and particularly withoutdeparting from my invention but What I clalm and desire to secure byLet- 1. Ina screw driver, a hollow handle, a restricted angular openinat one end, a blade of a cross-section a apted to fit said opening, athreaded portion on one end of said blade, a threaded sleeve within saidhollow handle adapted .to engagethe threaded portion of said blade,revoluble in said handle to feed said blade, a pusher cap on one end ofsaid handle having a bearing for the end of said sleeve.

2. In a watch makers screw driver, a

pusher cap, a hollow handle ada ted throughout 1ts length to receive abla e, a sleeve within sai blade handle, a blade and means of engagementbetween said sleeve and blade whereby the same may be fedi a projectionon the end of the sleeve exten ing beyond the handle and into the pushercap, an o ening in the cap beside the projecting en of said adjustingsleeve, whereby access is had laterally to the projectin end of thesleeve for the purpose descri d.

3. In a watch makers screw driver, a hollow body portion ada ted toreceive throughout its length a b ade, a blade, a feeding sleeve withinsaid body portion, a cap at one end of said body portion resenting athrust bearing for said fee ing sleeve, an angular restricted opening atthe op osite end of said bodiylportion.

igned this 27th day 0 pl 1908.

- LOUIS E. F. WAOHTER.

Witnesses:

' M. O. WELLS,

HERMANN F. CUNTZ.

